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Desulphu-riz-ing Apparatus. No.- 242.870. Patented June I4, |881.

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ju UNITED STATES PATENT OFFICE.

OSCAR E. BOOMER AND HENRY R. RANDALL, OE BROOKLYN, ASSICNORS, BYMEsNE-AND DIRECT ASSIGNMENTS, To THE AUTOMATIC DESULPHURIZ. ING COMPANY,OE NEW YORK, N. Y.

DESULPHURIZING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 242,870, dated June 14,1881.

Application filed November 6, 1880. (No model.)

To all whom tt may concern:

Be it known that we, OSCAR F. BOOMER and HENRY It. RANDALL, bothcitizens ofthe United States, residing at Brooklyn, in the county ofKings and State of New York, have invented new and useful Improvementsin DesulphurizingApparatus, of which thefollowin g is a specification.

This invention relates to apparatus for the removal of sulphur from oresby roasting.

Prior-to our invention a desulphurizing apparatus has been provided withau endless scries of Stirrers or Scrapers arranged to traverse theroasting-hearth, and hence such feature is not broadly claimed in thisapplication. Furnaces have also been provided with a screwconveyer forfeeding the ore continuously from the hopper to a retort; and in oneinstancea lon gitudinally-grooved feed-roller has been arranged belowthe hopper for feedingthe ore upon a series of stationary inclinedterraces. The diiference between these devices and our invention, inwhich the rotary intermittent feed-cylinder is arranged within thehopper and adapted to delivera separatedeniteqnantity of ore to cachscraper of an endless Series of Scrapers, will be apparent frornthefollowing specification.

' Our invention consists in the combination, in a desulphurizingapparatus, of the horizontal roasting-hearth constituting the bottom ofan oblong casing, with a concave at the front end of the hearth belowthe hopper, a series of Scrapers extending across the hearth and carriedby endless chains, so as to traverse the hearth and carry the ore overthe same, the hopper arranged at the fron t end of the casing, with apassage-way from the hopper located directly over the concave at thesaid front end ofthe hearth, and the intermittentfeed-cylinder arranged-within the hopper and provided with longitudinal cavities, whichreceive and deliver a separate and definite' charge of crushed ore toeach Scraper passing over the surface ot' the concave, as hereinaftermore fully set forth.

In the accompanying drawings, Figure lis a longitudinal vertical sectionof an apparatus constructed according to our Invention. Fig.

2 is a plan view of `the apparatus with a por- 5o tion ofthe top of thecasing removed.

The letter A indicates a horizontal roastinghearth arranged upon afurnace, B, of which C is the tire-place. The hearth Ais constructed ofiron, and forms the bottom of an oblong iron 5 5 box orcasing, A'.Within this box orcasin g, and at opposite ends thereof, are arrangeddrums D D', mounted upon transverse Shafts d d', journaled in theopposite side walls of the casing, and these drums carry two or moreend- 6o less chains, E, connected by suitable crossrods, and providedwith transverse Scrapers F, extending across the hearth, and arranged atequal distances apart, said Scrapers being of such width as to touch thehearth and scrape 6 5 its surface when the chains are in Inotion. Theshafts d and d project sufficiently far through the casing at one sideof the latter to receive belt-wheels, by which and a suitable beltmotion maybe transmitted from one to 7o the other, and one of saidshafts also carries a belt-wheel for connection with a suitable Inovtor.

Upon the top of the casing, near its front or fire-place end, isarranged a hopper, G, con- 75 nected with the interior of the casing bya transverse oblon g passage-way; 7L, and within the hopper, at themouth of'said passage-way, is mounted a rotary feed-cylinder, I,preferably of solid cast-iron, and having in its surface 8o longitudinalcavities 7c. These cavities are of such capacity that when the cylinderis rotated after the hopper is filled with crushed ore, and the chains Eare movingin the direction indicated by the arrows, cach cavity will 8 5carry to the mouth of passage-way li a proper quantity of the orc, to beremoved from the end of the hearth upon which it falls by one ot' thescraperSF, each uof said Scrapers thus being supplied With a deiinitequantity of ore, 9o which it can easily move and thoroughly agitate asit traverses the hearth. V

At the forward end of the hearth, directly below the hopper and thepassage-way It leading therefrom, is a concave, A2, constituting a 95portion of the hearth. The Scrapers, in their travel, pass over thesurface of this concave, upon which the Crushed ore is intermittentlydropped in definite quantities through the passage-way h. This concavedoes away with such corners in the casing as the ore would'be liable tolodge in, and hence all of each charge falling upon the concave will betaken by the scraper which arrives at the concave at the proper momentfor taking the said charge. The scrapers are arranged at such distanceapart and the speed of travel of chains and rotation of thefeed-cylinder is so timed that the serapers successively arrive inposition to remove separately the charges of ore that are intermittentlyfed or delivered from the feedcylinder to the passage-way h, throughwhich they drop down upon the concave A2. Clogging of the hearth is thusprevented, and a uniform mass of ore is caused to move thereom and bethoroughly agitated and exposed to the heat and air. The feed-cylinderlis rotated by means of a belt-wheel mounted upon the projecting end ofone of its journals and connected with another wheel of suitable sizeupon the shaft d of drum D. When the charges of ore have been movedalong the entire length of the roasting-hearth, they are successivelydumped into a trough, L, projecting downward transversely from thehearth and open at one end, where it is provided with a spoutor chute,l. Longitudinally in the trough L is mounted a conveying-screw, M,consisting of a shaft or cylinder, m, provided with spiral blades m. Oneof the journals of this cylinder or shaft projects through the end wallof the trough, and is provided with a belt-wheel, which receives motionthrough a belt from another wheel of suitablesize upon the shaft d ofdrum D. The office of the conveying-screw is to remove the desulphurizedore and deliver it into any suitable' receptacle.

From the top of the casing, near its rear end, there leads an air-pipe,N, connected with the induction-pipe of a suction air-draft apparatus,O, which may be operated by belt connection with any rotary shaft of theapparatus or its motor. An entrance-passage, p, for air is arranged nearthe front end of the top of the casing, and a passage, q, leads from therear end of the casing to the chimneyR ofthe furnace.

rlhe operation of the apparatus is as follows: The moving parts beingsuitably connected and put in motion and crushed ore iilled into thehopper G, the feed-cylinder I delivers the ore intermittently indefinite charges upon the concaved front end ot the hearth A, which hasbeen heated to ared heat by the furnace. The Scrapers l take thesecharges separately and force them along the surface of the hearth,turning and agitating the ore, so that every particle is exposedthoroughly to the heat and air and the sulphur expelled. The air whichis drawn through the casing by the draft apparatus causes combustionofthe sulphur, and vapors escape partly to the chimney and partlythrough the air-pipe N, the desulphurized ore -being carried off by theconveying-screw M.

The combination, in a desulphurizing apparatus, of the horizontalroasting-hearth constituting the bottoni of an oblong casing, with theconcave A2 at the front end of the hearth below the hopper, the seriesof Scrapers eX- tending across the hearth and carried by endless chains,so as to traverse the hearth and carry the ore over the same, the hopperarranged at the front end of the casing, with the passage-'way from thehopper located directly over the said concave, and the intermittent-feedcylinder arranged within the hopper and provided with longitudinalcavities, which receive and deliver separate and definite charges otcrushed ore to each scraper passing over the surface of the concave,substantially as described.

-In testimony whereof we have hereunto set our hands and seals in thepresence of two subscribing witnesses.

oscAn n. BooMER. [n s] HENRY n. RANDALL. [n sj Witnesses to thesignature of Oscar F. Boomer:

Tnos. B. CLIFFORD, EDWARD D. BnrTENs. Witnesses to the signature ofHenry It. Randall:

J AMES L. NoRRrs, J AMES A. RUTHEaFonD.

